KR101374584B1 - Plastic sheet for packaging container - Google Patents

Abstract

When storing and transporting in the state of live fish, there is provided a plastic sheet for a packaging container, which reduces the activity of microorganisms remaining in the package such as raw fish meat before packing or adhered to after packing, and at the same time suppresses the propagation of the microorganisms. .

The plastic sheet for packaging containers was made of a polyethylene film containing an antioxidant and an antibacterial agent in the inner layer, a high gas barrier polyvinyl alcohol film in the middle layer, and a three-layer structure plastic sheet in which the polypropylene film was laminated on the outer layer.

Polyethylene film, polyvinyl alcohol film, plastic sheet for packaging container.

Description

Plastic sheet for packaging container {PLASTIC SHEET FOR PACKAGING CONTAINER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic sheet for a packaging container for packaging long items such as raw fish meat in a container for long-term storage.

Large fish such as tuna and bonito that have been caught by ocean fishing or cultivated in a distant place have been removed from the fishing vessels or breeding grounds where they have been caught or cultivated, and then frozen or cut into pieces and frozen to low temperatures. It is stored and transported to consumption place.

On the other hand, when storing and transporting to a consumption place in the state of a live fish body, as previously proposed in Patent Documents 1 and 2, the whole or cut and divided into pieces made of plastic film with low oxygen gas permeability After encapsulating the inside of the bag under reduced pressure, sealing and packing it, the packaging bag or a plurality of packaging bags packed in the same manner were stored at low temperature with a coolant such as ice in a foamed plastic container or the like.

However, the conventional method of using a gas barrier plastic film bag for packaging, using a foamed plastic container, etc. as an exterior, and storing and transporting the raw fish in the state of the live fish, remains in the live fish before packing or adheres after packing. The propagation of microorganisms, etc. cannot be suppressed, and it is not enough to keep fresh fishes for a long time and preserve them. In addition, when the inside of the plastic film bag is degassed using a vacuum packaging machine, the inside of the package is depressurized, for example, the drip outflow from the raw tuna cut is promoted, which causes the development of new bacteria. The same phenomenon occurs in the case of live meat.

Patent Document 1: Japanese Unexamined Patent Publication No. 2000-335599

Patent Document 2: Japanese Unexamined Patent Publication No. 2006-14630

The problem that the invention is trying to solve

Therefore, the present invention improves the conventional plastic film or sheet for packaging containers, and, for example, when stored and transported in the state of live fish, the activity of microorganisms remaining before packing or adhered to the package such as raw fish meat It is an object of the present invention to provide a plastic sheet for a packaging container which reduces the growth of the microorganism and suppresses the propagation of the microorganisms.

Means for solving the problem

In order to solve the above problems, the invention of claim 1, the plastic sheet for packaging containers is a polyethylene film containing an antioxidant and an antimicrobial agent in the inner layer, a two-layer structure plastic sheet laminated a high gas barrier polyvinyl alcohol film on the outer layer Characterized in that made.

The invention of claim 2 is characterized in that the polyethylene film contains 1 to 20 parts by weight of the antioxidant and the antimicrobial agent per 100 parts by weight of the polyethylene film.

The invention of claim 3 is characterized in that the two-layer structure plastic sheet has a thickness of a polyethylene film of 50 to 200 micrometers and a thickness of a polyvinyl alcohol film of 12 to 30 micrometers.

According to the invention of claim 4, the plastic sheet for packaging container is a polyethylene film containing an antioxidant and an antimicrobial agent in the inner layer, a high gas barrier polyvinyl alcohol film in the middle layer, and a three-layer structure plastic sheet in which the polypropylene film is laminated on the outer layer. Characterized in that made.

The invention of claim 5 is characterized in that the polyethylene film contains 1 to 20 parts by weight by adding an antioxidant and an antimicrobial agent per 100 parts by weight of polyethylene film.

In the invention of claim 6, the three-layer structure plastic sheet is 50 to 200 micrometers in thickness of polyethylene film, 12 to 30 micrometers in thickness of polyvinyl alcohol film, and 15 to 50 micrometers in thickness of polypropylene film. It is characterized by one.

The invention of claim 7 is characterized in that the polyethylene film further contains a preservative.

According to the eighth aspect of the present invention, a bag is produced from the plastic sheet for packaging container, has an opening that can be opened in a part of the periphery, and the opening is formed to be sealed by a fastener, and is folded flatly and thinly at the time of non-storing the object. It is characterized by the above-mentioned.

Effects of the Invention

According to the present invention, since the polyethylene film containing an antioxidant is used in the inner layer of the two-layer structure plastic sheet in contact with the objects such as raw fish meat, the antioxidant action of some antioxidants flowing out on the inner surface of the inner layer is used. The generation of oxygen or the like derived from carbonic acid gas remaining before packaging can be suppressed, for example, the activity of aerobic bacteria can be significantly reduced, and as a result, the antibacterial action can be increased. In addition, since the antimicrobial agent is contained, the antioxidative effect of some of the antioxidants and the antimicrobial agent that flowed on the inner surface of the inner layer suppresses the propagation of microorganisms such as bacteria that have adhered to the package after packaging, thereby causing the decay of the package to progress and odor. Can be prevented.

In addition, the transparency of the polyethylene film is relatively good, and the situation of the freshness of the package can be seen from the outside of the inner layer. In addition, since the polyethylene film has excellent water barrier property, there is no fear that the drips and other moisture naturally released from the contents penetrate the inner layer and are released to the outside.

The first embodiment of the present invention relates to a two-layer structure plastic sheet. Since the polyvinyl alcohol film with high gas barrier property is used for the outer layer of the two-layer structure plastic sheet, it has excellent gas barrier properties and transparency, and when the gas is generated by the decay of the package, the gas penetrates the outer layer and is released to the outside. There is no fear that outside air or the like penetrates through the outer layer and invades the inner layer, and the state of the freshness of the package can be seen from the outside of the outer layer.

Since 100 parts by weight of polyethylene film (representing 100 parts by weight of polyethylene resin as the raw material of the film, the same below), a polyethylene film containing 1 to 20 parts by weight of an antioxidant and an antimicrobial agent was used. The microorganisms attached to the cell are destroyed in a short time, so that the progress of the decay of the stored object can be further prevented.

When the polyethylene film having the content ratio of the antimicrobial agent and the antioxidant is in the range of 1: 1/100 to 1: 100 as the antimicrobial agent: antioxidant, the synergistic effect of the antioxidant and the antimicrobial agent is exerted. In general, the use of polyethylene film having an antimicrobial agent and antioxidant content in the range of 1: 1/10 to 1:10 exhibits a good balance of antioxidant activity and antimicrobial activity, regardless of the kind of raw fish and the like. In addition, since a plastic sheet for packaging containers with high versatility can be obtained, it is preferable.

Since a high gas barrier polyvinyl alcohol film having an oxygen gas permeability of 1.0 cc / m ² · d · m or less is used for the outer layer, gas generated by the decay of the contained matter penetrates the outer layer to be released to the outside, It is less likely to penetrate the outer layer and penetrate the inner layer, thereby significantly lowering the activity of aerobic microorganisms and further suppressing its reproduction. In particular, it is preferable to use a high gas barrier polyvinyl alcohol film having an oxygen gas permeability of 0.5 to 0.7 cc / m ² · d · atm.

Since the thickness of the polyethylene film was 50-200 micrometers and the thickness of the polyvinyl alcohol film was 12-30 micrometers, the two-layer structure plastic sheet had the effect of suppressing the growth of microorganisms by the polyethylene film containing an antioxidant and an antimicrobial agent. The gas barrier effect by a polyvinyl alcohol film is exhibited in a balanced manner, and the plastic sheet for packaging containers with high versatility can be obtained.

The second embodiment of the present invention relates to a three-layer structure plastic sheet. Since the plastic sheet for packaging containers consists of a polyethylene film containing an antioxidant and an antimicrobial agent in the inner layer, a high gas barrier polyvinyl alcohol film in the middle layer, and a three-layer structure plastic sheet in which the polypropylene film is laminated on the outer layer, The mechanical strength and transparency of the film are good and the colorability is excellent, so it is resistant to impact from the outside of the outer layer and can be used for a long time. Therefore, the packaging container manufactured from this 3-layered plastic sheet can also serve as an exterior packaging by acting as an external packaging itself. In addition, the moisture barrier property of the polypropylene film prevents external moisture from penetrating the outer layer to reach the polyvinyl alcohol film of the intermediate layer. Thereby, the polyvinyl alcohol film of an intermediate | middle layer can avoid the loss of the gas barrier effect by the influence of moisture.

Since the thickness of the polypropylene film was 15 to 50 micrometers, the three-layer structure plastic sheet exhibited a balance between the propagation suppression effect of the microorganisms attached to the contents, the gas barrier effect, the impact resistance effect and the contents effect in a balanced manner. A plastic sheet for a high packaging container can be obtained.

In the two-layer and three-layer structure plastic sheets, a preservative may be further contained in the polyethylene film of the inner layer in contact with the object. This prevents the invasion, development, and growth of microorganisms by some of the preservatives flowing on the inner surface of the inner layer, and the storage of products such as raw fish and meat, which are particularly important in freshness, due to the synergistic effect of antioxidants, antimicrobials and preservatives. Corruption can be prevented.

Since 100 parts by weight of polyethylene film (representing 100 parts by weight of polyethylene resin as a raw material of the film, the same) below, a polyethylene film containing 1 to 20 parts by weight of an antioxidant, an antimicrobial agent, and a preservative is used, without impairing the properties of the polyethylene film. It is possible to obtain a plastic sheet for a packaging container that can maintain the freshness of the contents for a long time.

When the polyethylene film which contains the content of the antioxidant and antimicrobial agent added together and the content rate of the preservative is in the range of 1: 1/10-1:10, the synergistic effect of antioxidant, antibacterial agent, and antiseptic | preservative is exhibited. In general, the use of a polyethylene film having the above content ratio in the range of 1: 1/5 to 1: 5 increases the synergistic effect of the antioxidant, the antimicrobial agent and the preservative, so that the antioxidant, antimicrobial and antiseptic properties are balanced. It is preferable because a highly versatile plastic sheet for packaging containers can be obtained, which is very suitable for a storage material which is exerted and, in particular, fresh fish meat and the like, in which freshness is required.

The packaging container according to the present invention is made of the plastic sheet for packaging container, has an opening which can be opened in a part of the periphery, and forms the opening so as to be sealed by a fastener, and is flat and thin at the time of non-storage of the object. Since it is configured to be folded, the sealing bag can be formed during the storage of the articles for a long time to suppress the progress of decay of the articles and the occurrence of odors, and to prevent the leakage of moisture, gas, etc. generated from the articles to the outside. In addition to being able to view the objects from the outside, it is convenient for storing and storing a large number in advance when storing and using them, and facilitating the storing process of the objects.

1 is a cross-sectional view of the first embodiment of the present invention.

2 is a sectional view of a second embodiment of the present invention.

3 is a perspective view of a packaging container manufactured from a three-layer structure sheet according to the second embodiment of the present invention.

Fig. 4 is a diagram showing the result of measuring the viable cell count of bacteria in live tuna at 10 ° C to 15 ° C.

Fig. 5 shows the results of measuring the viable cell count of bacteria in live tuna at 10 ° C to 20 ° C.

Fig. 6 shows the results of measuring the permeation amount of hydrogen sulfide.

7 is a diagram showing a result of measuring a permeation amount of a decaying component.

8 is a diagram showing a K value measurement result in raw tuna.

Explanation of symbols

1: Plastic sheet for packaging containers of the first embodiment of the present invention

2, 12: polyethylene film

3, 13: polyvinyl alcohol film

5: antioxidant and antibacterial agent

11: plastic sheet for packaging containers of the second embodiment of the present invention

14 polypropylene film

6: packaging container of the present invention

7: bag body

8: fastener

9: upper plastic sheet

9 ': bottom plastic sheet

BEST MODE FOR CARRYING OUT THE INVENTION

Next, the best form of the plastic sheet for packaging containers of this invention is demonstrated based on drawing. BRIEF DESCRIPTION OF THE DRAWINGS The cross section of 1st Embodiment of the plastic sheet for packaging containers of this invention is shown. 2 is a sectional view of a second embodiment of a plastic sheet for a packaging container of the present invention. In addition, the same code | symbol is attached | subjected to the same component through the whole figure.

The plastic sheet 1 for packaging containers of the first embodiment shown in FIG. 1 is a polyethylene film 2 having a thickness of 50 to 200 micrometers as an inner layer, and preferably 100 micrometers thick, as an outer layer, having a thickness of 12 to 30. The two-layer structure sheet which laminated | stacked the high gas barrier polyvinyl alcohol film 3 of 12 micrometers suitably is comprised.

Antioxidant and antimicrobial agent are mixed in the polyethylene film 2, and you may add a preservative. In addition, antioxidant and antimicrobial agent are typically shown, and the same code | symbol is attached | subjected to 5 (the same also when preservative is added). The content of antioxidant, antimicrobial agent, and preservative is changed depending on the characteristics of the specific contents of the case where the two-layer structure sheet is made into a packaging container within the range of the content of the third party, for example, the type and size of raw fish meat. It is preferable. For example, in order to suppress the progress of decay, the content of antioxidants is increased when used in a particularly effective anti-oxidant, and the content of antimicrobials is particularly high, especially when used in a strong antimicrobial. When it is used for an effective thing, it is preferable to raise the content rate of a preservative.

In addition, the thing is not limited to raw fish meat, Grains, such as rice and barley, may be carcasses of a person or an animal.

An antioxidant is contained in combination of polyphenols such as flavonoids, tannins, anthocyanins, isoflavones, catechins, vitamin C, vitamin E, and the like, in combination of one or more selected according to the properties of the specific contents of the packaging container. It is desirable to.

The antimicrobial agent preferably contains a combination of one or more selected from silver ionic antimicrobial agents, phenol ether antiseptics, natural antimicrobial agents, glycerin fatty acid esters, and the like, depending on the properties of the specific contents of the packaging container.

It is preferable to contain the antiseptic | preservative combining one type or many types chosen from the preservatives of parabens and other preservatives according to the property of the specific accommodating object in the case of using a packaging container.

The content of the antioxidant and the antimicrobial agent in the polyethylene film 2 is 1-20 parts by weight of the antioxidant and the antimicrobial agent per 100 parts by weight of the polyethylene film, and most preferably 3-10 parts by weight. In addition, the content ratio of the antimicrobial agent and the antioxidant is in the range of 1: 1/100 to 1: 100 as an antimicrobial agent: antioxidant, and very preferably in the range of 1: 1/10 to 1:10.

In the case where the preservative is further contained, it is preferably 1 to 20 parts by weight, in particular 3 to 10 parts by weight, based on the total amount of the antioxidant, the antibacterial agent and the preservative, per 100 parts by weight of the polyethylene film.

In addition, when a low density polyethylene film is used as the polyethylene film, since it is excellent in heat seal and transparency, it is easy to weld around the bag when produced by a bag maker, and a highly transparent packaging container having a strong seal strength is obtained. It is preferable because it can be obtained easily.

The polyethylene film 2 has a high gas barrier polyvinyl alcohol film having an oxygen gas permeability of 1.0 cc / m ² · d · atm or less and 0.5 to 0.7 cc / m ² · d · atm as an outer layer (3). ), Since the gas barrier is particularly high, a high-quality plastic sheet for packaging containers with high transparency can be obtained. In addition, when a stretched polyvinyl alcohol film is used as the high gas barrier polyvinyl alcohol film, a super gas barrier two layer structure sheet can be obtained, which is preferable.

In addition, the thickness of the 2-layer structure sheet, the thickness of an inner layer, and an outer layer is not specifically limited, It can change arbitrarily according to the kind and purpose of the packaging container in which it is used. For example, for the packaging of a single raw tuna, the polyethylene film thickness is 50-200 micrometers, the polyvinyl alcohol film thickness is 12-30 micrometers, and the total thickness of the two-layer structure sheet is 62-220 micrometers. It is preferable to set it as.

The plastic sheet 11 for packaging containers of 2nd Embodiment shown in FIG. 2 is 50-200 micrometers in thickness as an inner layer, The polyethylene film 12 of thickness 100 micrometers suitably is 12-30 in thickness as an intermediate | middle layer. A high gas barrier polyvinyl alcohol film 13 having a micrometer, suitably 12 micrometers thick, and a polypropylene film 14 having a thickness of 15-50 micrometers, and very suitably 20 micrometers thick as an outer layer are laminated. One 3-layer structure sheet is comprised.

The content of the antioxidant and the antimicrobial agent in the polyethylene film is 1-20 parts by weight of the antioxidant and the antimicrobial agent per 100 parts by weight of the polyethylene film in the same manner as in the first embodiment, and most preferably 3-10 parts by weight. to be. In addition, the content ratio of the antimicrobial agent and the antioxidant is in the range of 1: 1/100 to 1: 100 as an antimicrobial agent: antioxidant, and very preferably in the range of 1: 1/10 to 1:10. It is preferable to use a low density polyethylene film as the polyethylene film in the same manner as in the first embodiment.

In the case where the preservative is further contained, it is 1 to 20 parts by weight, in particular 3 to 10 parts by weight, based on 100 parts by weight of the polyethylene film, generally an antioxidant, an antimicrobial agent and a preservative in the same manner as in the first embodiment. desirable.

It is preferable to use the stretched polyvinyl alcohol film as the high gas barrier polyvinyl alcohol film 13 laminated as the intermediate layer, in the same manner as the outer layer of the first embodiment.

In the intermediate layer of the polyvinyl alcohol film 13, a polypropylene film 14 is laminated as an outer layer. It is preferable to use a stretched polypropylene film as the polypropylene film because a three-layer structure sheet with improved mechanical strength can be obtained.

In addition, the thickness of the 3-layer structure sheet, the thickness of an inner layer, an intermediate | middle layer, and an outer layer is not specifically limited, It can change arbitrarily according to the kind and purpose of the packaging container which it uses. For example, when used in a packaging container of raw tuna, the thickness of the polyethylene film 12 50 ~ 200 micrometers, the thickness of the polyvinyl alcohol film 13 12 ~ 30 micrometers, the polypropylene film 14 It is preferable to make the thickness of 15-50 micrometers and the total thickness of a 3-layer structure sheet into 77-280 micrometers.

FIG. 3: shows the perspective view of the packaging container 6 which produced the bag from the plastic sheet 11 for packaging containers of the said 2nd embodiment, and processed it into the storage preservation bag of one 100 kg raw tuna. The encapsulating body 7 can be folded thin and flat when stored, and in use, the fastener 8 is opened, and the upper and lower plastic sheets 9 and 9 'which are folded to form the surface and the back side are stretched up and down. It is possible to easily form a box-shaped storage container that is stable in shape only by expanding. Therefore, the storage operation of the objects is easy, and the storage container itself also serves as a pipe.

Next, an Example demonstrates this invention in detail.

Example 1

As a test piece of the present invention, a polyethylene film having a size of about 50 mm X 50 mm and a thickness of about 0.1 mm as an inner layer, and a high gas barrier polyvinyl alcohol having a thickness of about 0.012 mm as an intermediate layer, of the three-layered plastic sheet of the second embodiment shown in FIG. As the film and the outer layer, a polypropylene film having a thickness of about 0.020 mm and specimen No1 having a total thickness of about 0.132 mm of the three-layer structure sheet were used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film. Fig. 2 schematically shows a state in which 5 parts by weight of the antioxidant and 5 parts by weight of the antibacterial agent are dispersed and mixed in the polyethylene film of the inner layer.

As a test method, the method according to "JIS Z 2801 (antibacterial processed product, antimicrobial test method, antibacterial effect)" is adopted, and inoculate Escherichia coli as a test bacterium on one side which contacts the thing of this polyethylene film, and test piece 1 immediately after inoculation. per number of viable cells for the measurement -1 2.4 X 10 ^5, number of live cells for the measurements -2 2.6 X 10 ^5, number of live cells for the measurements -3 2.5 X 10 ^5, mean number of viable cells of 2.5 X 10 ⁵ were measured. Sampling was taken after 12 hours and after 24 hours.

Sample No1 was measured at 35 ° C. after 12 hours, and the viable cell count was reduced to less than 10 ¹ for both Measurement-1 to Measurement-3 and the average value. The same was measured after 24 hours, and viable count was hardly detected.

Table 1 shows the result of measuring the viable cell count of Escherichia coli of the sample No1 of this Example 1.

As Comparative Example 1 for Example 1, Sample No2, in which 10 parts by weight of silver ionic antimicrobial agent was dispersed and incorporated, was used as the antimicrobial agent per 100 parts by weight of polyethylene film in the low-density polyethylene film of the inner layer of the same three-layered plastic sheet as Specimen No1. . In addition, the live cell count of Escherichia coli immediately after inoculation of sample No2 was the same as that of sample No1 about the measurement -1-the measurement-3, and an average value.

Sample No2 was measured at 35 ° C. after 12 hours, and the viable cell count was less than 80 for measurement-1, the viable cell number was less than 70 for measurement-2, the viable cell number was less than 90 for measurement-3, Decreased to less than 80 The same measurement was made after 24 hours, and the viable cell count was reduced to less than 10 for the measurement-1 to the measurement-3 and the average value.

Table 1 shows the results of measuring the viable cell count of Escherichia coli of Specimens No2 of Comparative Example 1.

As Comparative Example 2 for Example 1, Sample No3, in which 10 parts by weight of catechin was dispersed and incorporated as an antioxidant per 100 parts by weight of polyethylene film, was used in the low density polyethylene film of the inner layer of the same three-layered plastic sheet as Sample No1. In addition, the live cell count of Escherichia coli immediately after inoculation of sample No3 was the same as sample No1 about the measurement -1-the measurement -3, and an average value.

Sample No3 was measured after 12 hours at 35 ° C., and the number of viable cells was 3.1 × 10 ² for measurement-1, 2.9 × 10 ² for measurement- ² , 3.4 × 10 ² for the measurement-3, and the mean value. Viable count 3.1 X 10 ² was measured. The same measurement was made after 24 hours, and the viable cell count was reduced to less than 10 for the measurement-1 to the measurement-3 and the average value.

Table 1 shows the results of measuring the viable cell count of Escherichia coli of sample No3 of Comparative Example 2.

As the comparative example 3 about Example 1, the sample No4 which does not contain additives, such as an antioxidant and an antimicrobial agent, was used in the low density polyethylene film of the inner layer of the 3-layered plastic sheet similar to sample No1. In addition, the live cell count of Escherichia coli immediately after inoculation of sample No4 was the same as that of sample No1 about the measurement -1-the measurement-3, and an average value.

Sample No4 was measured at 35 ° C. after 12 hours, and the number of viable cells was 2.8 X 10 ⁶ for measurement-1, 2.6 X 10 ⁶ for measurement-2, 3.0 X 10 ⁶ for measurement-3, and the mean value. Viable count 2.8 X 10 ⁶ was measured. Was measured in the same way 24 hours later, the number of live cells for the measurements -1 1.4 X 10 ^7, viable cells for measuring -2 1.4 X 10 ^7, number of live cells for the measurements -3 1.3 X 10 ^7, 1.4 X number of viable cells of the mean value 10 ⁷ was measured.

Table 1 shows the results of measuring the viable cell count of Escherichia coli of sample No4 of Comparative Example 3.

Example 2

As a test piece of the present invention, a polyethylene film having a size of about 50 mm X 50 mm and a thickness of about 0.1 mm as an inner layer, and a high gas barrier polyvinyl alcohol having a thickness of about 0.012 mm as an intermediate layer, of the three-layered plastic sheet of the second embodiment shown in FIG. As the film and the outer layer, a polypropylene film having a thickness of about 0.020 mm and specimen No1 having a total thickness of about 0.132 mm of the three-layer structure sheet were used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, the method according to "JIS Z 2801 (Antibacterial processed product, antimicrobial test method, antimicrobial effect)" was adopted similarly to the said Example 1, and the yellow grapes as a test bacterium on the single side which contact | connects the thing of this polyethylene film. After inoculation, immediately after inoculation, the number of viable cells 1.2 X 10 ⁵ for measurement-1, the number of viable cells 1.5 X 10 ⁵ for measurement-2, and the number of viable cells 1.2 X 10 ⁵ for measurement-3, average value 1.3 X 10 ⁵ was measured. Sampling was adopted after 12 hours and after 24 hours.

Sample No1 was measured at 35 ° C. after 12 hours, and the viable cell count was reduced to less than 10 for all the measurements-1 to 3 and the average value. The same was measured after 24 hours, and viable count was hardly detected.

Table 1 shows the results of measuring viable cell counts of Staphylococcus aureus of sample No1 of this Example 2.

As Comparative Example 4 for Example 2, Sample No2, in which 10 parts by weight of silver ionic antimicrobial agent was dispersed and mixed, was used as an antimicrobial agent per 100 parts by weight of polyethylene film in the low-density polyethylene film of the inner layer of the same three-layered plastic sheet as Specimen No1. . In addition, the live cell count of Staphylococcus aureus immediately after inoculation of sample No2 was the same as that of sample No1 about the measurement -1-the measurement-3, and an average value.

Sample No2 was measured at 35 ° C. after 12 hours, and the viable cell count was less than 100 for measurement-1, the viable cell number was less than 90 for measurement-2, the viable cell number was less than 100 for measurement-3, Decreased to less than 100. The same measurement was made after 24 hours, and the viable cell count was reduced to less than 10 for the measurement-1 to the measurement-3 and the average value.

Table 1 shows the results of measuring the viable cell count of Staphylococcus aureus of Sample No2 of Comparative Example 4.

As Comparative Example 5 for Example 2, Sample No3 containing 10 parts by weight of catechin dispersed as an antioxidant per 100 parts by weight of polyethylene film was used in the low density polyethylene film of the inner layer of the same three-layered plastic sheet as Sample No1. In addition, the live cell count of Staphylococcus aureus immediately after inoculation of sample No3 was the same as that of sample No1 about the measurement -1-the measurement-3, and an average value.

When I after 12 hours measured sample No3 under 35 ℃, number of viable cells for the measurement -1 1.8 X 10 ^2, number of viable cells for the viable cell count 1.6 X 10 ^2, measured for the measurement -3 -2 1.6 X 10 ^2, of the mean value Viable count 1.7 × 10 ² was measured. The same measurement was made after 24 hours, and the viable cell count was reduced to less than 10 for the measurement-1 to the measurement-3 and the average value.

Table 1 shows the results of measuring the viable cell count of Staphylococcus aureus of Sample No3 of Comparative Example 5.

As the comparative example 6 about Example 2, the sample No4 which does not contain additives, such as an antioxidant and an antimicrobial agent, was used in the low density polyethylene film of the inner layer of the three-layered plastic sheet similar to sample No1. In addition, the live cell count of Staphylococcus aureus immediately after inoculation of sample No4 was the same as that of sample No1 about the measurement -1-the measurement-3, and an average value.

Sample No4 was measured at 35 ° C. after 12 hours, and the number of viable cells was 1.6 X 10 ⁶ for measurement-1, 1.4 X 10 ⁶ for measurement-2, 1.2 X 10 ⁶ for measurement-3, and the mean value. Viable cell count l.4 X 10 ⁶ was measured. The same measurement was made after 24 hours, and the number of viable cells was 2.5 X 10 ⁶ for measurement-1, 2.2 X 10 ⁶ for measurement-2, viable count 2.3 X 10 ⁶ for measurement-3, 2.3 X 10 ⁶ was measured.

Table 1 shows the results of measuring the viable cell count of Staphylococcus aureus of Sample No4 of Comparative Example 6.

[Table 1]

Example 3

As a test piece of the present invention, a polyethylene film having a size of about 50 mm X 50 mm and a thickness of about 0.1 mm as an inner layer, and a high gas barrier polyvinyl alcohol having a thickness of about 0.012 mm as an intermediate layer, of the three-layered plastic sheet of the second embodiment shown in FIG. As the film and the outer layer, a polypropylene film having a thickness of about 0.020 mm and specimen No1 having a total thickness of about 0.132 mm of the three-layer structure sheet were used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, the method according to "JIS Z 2801 (Anti-microbial processed product, antimicrobial test method, antibacterial effect)" was adopted similarly to the said Example 1, E. coli as a test bacterium on the single side which contacts the thing of this polyethylene film. Was inoculated, and immediately after inoculation, the number of viable cells 2.3 × 10 ⁵ per test piece was measured. Sampling used the thing after 24 hours.

Sample No1 was measured at 35 ° C. after 24 hours, and the viable cell count was reduced to less than 10.

Table 1 shows the results of measuring the viable cell count of Escherichia coli of the sample No1 of Example 3.

As a comparative example 7 for Example 3, a polyethylene film having a thickness of about 0.1 mm as an inner layer, a nylon film having a thickness of about 0.015 mm as an outer layer, and a two-layer structure plastic sheet having a total thickness of about 0.115 mm, having a size of about 50 mm X 50 mm Used. The polyethylene film of the inner layer does not contain additives such as antioxidants and antibacterial agents. In addition, the live cell count of Escherichia coli immediately after the inoculation of Comparative Example 7 was the same as that of sample No1.

When Comparative Example 7 was measured at 35 ° C. after 24 hours, the viable bacterial count of Escherichia coli increased to 1.3 × 10 ⁷ to 1.5 × 10 ⁷ .

Table 2 shows the result of measuring the viable cell count of Escherichia coli of Comparative Example 7.

Example 4

As a test piece of the present invention, a polyethylene film having a size of about 50 mm X 50 mm and a thickness of about 0.1 mm as an inner layer, and a high gas barrier polyvinyl alcohol having a thickness of about 0.012 mm as an intermediate layer, of the three-layered plastic sheet of the second embodiment shown in FIG. As the film and the outer layer, a polypropylene film having a thickness of about 0.020 mm and specimen No1 having a total thickness of about 0.132 mm of the three-layer structure sheet were used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, the method according to "JIS Z 2801 (Antibacterial processed product, antimicrobial test method, antimicrobial effect)" was adopted similarly to the said Example 1, and the yellow grapes as a test bacterium on the single side which contact | connects the thing of this polyethylene film. Inoculation was inoculated, and the number of viable cells 1.3 x 10 ⁵ per test piece was measured immediately after the inoculation. Sampling used the thing after 24 hours.

Sample No1 was measured at 35 ° C. after 24 hours, and the viable cell count was reduced to less than 10. Table 2 shows the results of measuring viable cell counts of Staphylococcus aureus of sample No1 of this Example 4.

Comparative Example 8 to Example 4, a polyethylene film having a thickness of about 0.1mm as the inner layer, a nylon film having a thickness of about 0.015mm as the outer layer, a two-layer structure plastic sheet having a total thickness of about 0.115mm, the size of about 50mm x 50mm Used. The polyethylene film of the inner layer does not contain additives such as antioxidants and antibacterial agents. In addition, the live cell count of Staphylococcus aureus immediately after the inoculation of Comparative Example 1 was the same as that of Sample No1.

When Comparative Example 8 was measured at 35 ° C. after 24 hours, the viable cell count of Staphylococcus aureus was increased to 2.0 × 10 ⁶ to 2.6 × 10 ⁶ .

Table 2 shows the result of measuring the viable cell count of Staphylococcus aureus of Comparative Example 8.

[Table 2]

Example 5

As a test packaging container of the present invention, a bag is produced from the three-layered plastic sheet of the second embodiment shown in FIG. As the alcohol film and the outer layer, a sample container of sample No 1 having a thickness of about 0.032 mm and a total thickness of about 0.132 mm and a bag size of about 30 cm x about 50 cm was used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, about 7 kg of fresh tuna chips were stored in a packaging container made of sample No1, and the viable bacteria count per 1 g of fresh tuna was measured. Sampling employ | adopted after 24 hours, 48 hours, and 72 hours after the start.

10 ℃ ~ 15 ℃ is under measurement to start when directly after the test the number of viable cells of less than 10 ^per raw tuna 1g, 24 hours later, after a slight decrease emitter start pm, and 48 hours, but did increase trace start o'clock decreased number of viable cells After 72 hours, the viable cell count of about 10 ¹ was measured.

The measurement result of the live microbial count of the bacteria in the raw tuna stored in the sample container of sample No1 of this Example 5 is shown in FIG.

As a comparative example 9 for Example 5, a polycarbonate sheet having a thickness of about 0.1 mm, containing no additives such as an antioxidant or an antimicrobial agent, was prepared, and the size of the bag was about the same as that of the sample. I used a bag. As a test method, about 7 kg of raw tuna chips were stored in Comparative Example 9 similarly to the packaging container made of sample No1, and the viable bacteria count per 1 g of fresh tuna was measured. Sampling employ | adopted after 24 hours, 48 hours, and 72 hours after the start.

Immediately after the start of the test at 10 ° C. to 15 ° C., less than 10 ¹ per ¹ g of fresh tuna is measured in the same number of viable cells as in the case of the No1 packaging container, and after 24 hours, almost the same number as the start, 48 hours later. The microbial count was increased to about 10 ¹ , but rapidly increased between 10 ³ and 10 ⁴ after 72 hours.

The measurement result of the live cell count of the bacteria in the raw tuna stored in this comparative example 9 is shown in FIG.

As Comparative Example 10 to Example 5, a polyvinyl chloride sheet having a thickness of about 0.1 mm was prepared containing no additives such as an antioxidant or an antimicrobial agent, and the size of the bag was almost the same as that of the sample No. 1 packaging container. General packaging bags for fish meat were used. As a test method, about 7 kg of raw tuna chips were stored in Comparative Example 10 similarly to the packaging container made of sample No1, and the viable bacteria count per 1 g of fresh tuna was measured. Sampling employ | adopted after 24 hours, 48 hours, and 72 hours after the start.

Immediately after the start of the test at 10 ° C. to 15 ° C., less than 10 ¹ per g of fresh tuna was measured, and almost the same number of viable cells was measured as in the case of the sample No1 packaging container, and increased slightly between 10 ¹ and 10 ² after 24 hours. The number of viable cells increased rapidly between 10 ³ and 10 ⁴ after 48 hours and between 10 ⁵ and 10 ⁶ after 72 hours.

The measurement result of the live cell count of the bacteria in the raw tuna stored in this comparative example 10 is shown in FIG.

Example 6

Example 6 is a measurement test for bacteria under 10 ° C to 20 ° C, while Example 5 is a measurement test for bacteria under 10 ° C to 15 ° C, and other test packaging containers, test methods, and sampling of the present invention are examples. Same as the case of 5.

Immediately after the start of the test at 10 ° C. to 20 ° C., the number of viable cells below 10 ¹ per gram of fresh tuna was measured and increased slightly between 10 ¹ and 10 ² after 24 hours, but between 10 ² and 10 ³ after 48 hours. After 72 hours, the viable cell count was increased between 10 ⁴ and 10 ⁵ .

The measurement result of the live microbe count of the bacteria in the raw tuna stored in the sample container of sample No1 of this Example 6 is shown in FIG.

Comparative Example 11 for Example 6 is a measurement test for bacteria under 10 ° C to 20 ° C, while Comparative Example 9 for Example 5 is a measurement test for bacteria under 10 ° C to 15 ° C, and others are different from Example 5 The same as in the case of Comparative Example 9.

Immediately after the start of the test at 10 ° C. to 20 ° C., less than 10 ¹ per g of fresh tuna was measured, and almost the same number of viable cells as in the case of the sample No ¹ packaging container was measured, and increased slightly between 10 ¹ and 10 ² after 24 hours. The number of viable cells increased rapidly between 10 ³ and 10 ⁴ after 48 hours and between 10 ⁵ and 10 ⁶ after 72 hours.

The measurement result of the live microbial count of the bacteria in the raw tuna stored in this comparative example 11 is shown in FIG.

Comparative Example 12 for Example 6 is a measurement test for bacteria under 10 ° C to 20 ° C, while Comparative Example 10 for Example 5 is a measurement test for bacteria under 10 ° C to 15 ° C. The same as in the case of Comparative Example 10.

Immediately after the start of the test at 10 ° C. to 20 ° C., less than 10 ¹ per g of fresh tuna is measured, and almost the same number of viable cells is measured as in the case of the sample No ¹ packaging container, and after 24 hours, between 10 ³ and 10 ⁴ , 48 hours The viable cell count was measured between 10 ⁵ and 10 ⁶ after 72 hours and between 10 ⁶ and 10 ⁷ after 72 hours.

The measurement result of the live microbial count of the bacteria in the raw tuna stored in this comparative example 12 is shown in FIG.

Example 7

As a test packaging container of the present invention, a bag is produced from the three-layered plastic sheet of the second embodiment shown in FIG. As the alcohol film and the outer layer, a packaging container made of a sample No 1 having a thickness of about 0.032 mm and a total thickness of about 0.132 mm and a bag size of about 15 cm x about 25 cm in a three-layered plastic sheet. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, about 100 g of growth was stored in a packaging container made of sample No1, and a sealed packaging container made of sample No1 was placed in a container of approximately 30 cm in height and width, and the decay gas permeated from the packaging container made of sample No1 in the sealed container. The permeation amount of one kind of hydrogen sulfide was measured by a detection tube. Sampling adopted the 1st-8th day.

When the permeation amount of hydrogen sulfide was measured at room temperature, the value of concentration (ppm) 0 was measured over the entire period of 1 to 8 days.

The measurement result of the permeation amount of hydrogen sulfide by the detection tube of Example 7 is shown in FIG. 6.

As a comparative example 13 with respect to Example 7, a polyvinyl chloride sheet having a thickness of about 0.2 mm and containing no additives such as an antioxidant or an antimicrobial agent was prepared, and the size of the bag was almost the same as that of the sample No. 1 packaging container. General packaging bags for fish meat were used. The test method and sampling are the same as in Example 7.

When the permeation amount of hydrogen sulfide was measured at room temperature, a concentration of 0 ppm on the 1st to 5th days, about 0.3 ppm on the 7th day, and about 1.25 ppm on the 8th day was measured.

The measurement result of the permeation amount of hydrogen sulfide by the detection tube of the comparative example 13 is shown in FIG.

As a comparative example 14 with respect to Example 7, a polyethylene film having a thickness of about 0.06 mm as the inner layer, a nylon film having a thickness of about 0.005 mm as the outer layer, a two-layer structure plastic sheet having a total thickness of about 0.065 mm, and an inner polyethylene film had an antioxidant An additive such as an antimicrobial agent was not contained, and a bag was produced, and a general packing bag for raw fish meat was used in which the size of the bag was almost the same as that of the sample No. 1 packaging container. The test method and sampling are the same as in Example 7.

Hydrogen sulfide permeation was measured at room temperature, with concentrations of 0 ppm on days 1 and 2, about 3.5 ppm on day 3, about 11 ppm on day 4, about 17.5 ppm on day 5, about 25 ppm on day 7, and about 16 ppm on day 8. The figures were measured.

The measurement result of the permeation amount of hydrogen sulfide by the detection tube of this comparative example 14 is shown in FIG. 6.

In Comparative Example 15 compared to Example 7, a polyethylene film having a thickness of about 0.05 mm and containing no additives such as an antioxidant or an antimicrobial agent was prepared, and the size of the bag was about the same as that for fresh fish meat. Regular packaging bags were used. The test method and sampling are the same as in Example 7.

Hydrogen sulfide permeation was measured at room temperature, with concentrations of 0 ppm on days 1 and 2, about 1.7 ppm on day 3, about 18.1 ppm on day 4, about 100 ppm on day 5, about 400 ppm on day 7, and about 300 ppm on day 8 The figures were measured.

The measurement result of the permeation amount of hydrogen sulfide by the detection tube of this comparative example 15 is shown in FIG. 6.

Example 8

As a test packaging container of the present invention, a bag is produced from the three-layered plastic sheet of the second embodiment shown in FIG. As the alcohol film and the outer layer, a packaging container made of a sample No 1 having a thickness of about 0.032 mm and a total thickness of about 0.132 mm and a bag size of about 15 cm x about 25 cm in a three-layered plastic sheet. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, about 100 g of growth was stored in a packaging container made of sample No1, and a sealed packaging container made of sample No1 was placed in a container of approximately 30 cm in height and width, and the rot component permeated from the packaging container made of sample No1 in the sealed container. GCMS measurement of the permeation amount of dimethyl sulfide, 2-butanone, dimethyl sulfide, ethanol, and methyl mercaptan, which is one kind, was performed. Sampling adopted the 1st-8th day.

When the permeation amount of the said decay component was measured at normal temperature, the numerical value of the decay component detection amount 0 was measured over the whole period of 1-8 days.

The measurement result of the permeation amount of the said decay component by GCMS measurement of this Example 8 is shown in FIG.

As Comparative Example 16 to Example 8, a polyvinyl chloride sheet having a thickness of about 0.2 mm was prepared containing no additives such as an antioxidant or an antimicrobial agent, and the size of the bag was about the same as that of the sample No. 1 packaging container. General packaging bags for fish meat were used. The test method and sampling are the same as in Example 8.

When the permeation amount of the decay component was measured at room temperature, the decay component detection amount was 0 on the first day, the decay component detection amount was about 180 on the second day, and the decay component detection amount was about 300 on the third day, and the decay component detection amount was about 380 on the fourth day, The numerical value of the decay component detection amount about 800 was measured on the component detection amount about 500 and 7-8 days.

The measurement result of the permeation amount of the said decay component by GCMS measurement of this comparative example 16 is shown in FIG.

As Comparative Example 17 to Example 8, the polyethylene film having a thickness of about 0.06 mm as the inner layer, the nylon film having a thickness of about 0.005 mm as the outer layer, the two-layer structure plastic sheet having a total thickness of about 0.065 mm, and the polyethylene film of the inner layer contained antioxidants or antibacterial agents. The additives, such as these, were prepared, and a bag was produced, and a general packing bag for raw fish meat was used, in which the size of the bag was almost the same as that of the sample No 1 packing container. The test method and sampling are the same as in Example 8.

When the permeation amount of the decay component was measured at room temperature, the decay component detection amount was 0 on the first day, the decay component detection amount was about 250 on the second day, and the decay component detection amount was about 500 on the third day, and the decay component detection amount was about 550 on the fourth day, and the decay amount was on the fifth day. The component detection amount was about 480, and the value of the corruption component detection amount was about 630 at 8 days, and the corruption component detection amount was about 620 at 8 days.

The measurement result of the permeation amount of the said decay component by GCMS measurement of this comparative example 17 is shown in FIG.

As a comparative example 18 to Example 8, a polyethylene film having a thickness of about 0.05 mm and containing no additives such as an antioxidant or an antimicrobial agent was prepared, and the size of the bag was about the same as that of the sample No 1 packaging container. Used regular packaging bags. The test method and sampling are the same as in Example 8.

When the permeation amount of the decay component was measured at room temperature, the decay component detection amount on day 1 was 0, and the decay component detection amount was about 260 on day 2, and the decay component detection amount was about 550 on day 3, and the decay component detection amount was about 600 on day 4, and the decay on day 5 The component detection amount was about 1300 on day 7, and the corruption component detection amount on about 3500 and the 8th day.

The measurement result of the permeation amount of the said decay component by GCMS measurement of this comparative example 18 is shown in FIG.

Example 9

As a test packaging container of the present invention, a bag is produced from the three-layered plastic sheet of the second embodiment shown in FIG. As the alcohol film and the outer layer, a sample container of sample No 1 having a thickness of about 0.032 mm and a total thickness of about 0.132 mm and a bag size of about 30 cm x about 50 cm was used. A low density polyethylene film was used as the inner polyethylene film, and 5 parts by weight of catechin as an antioxidant per 100 parts by weight of polyethylene film and 5 parts by weight of silver ionic antimicrobial agent as antimicrobial were dispersed and mixed in the low density polyethylene film.

As a test method, about 7 kg of raw tuna chips were stored in a packaging container made of sample No1, and the K value serving as an index of freshness of fresh tuna was measured. Sampling used the thing after 72 hours.

In addition, K value represents the total amount of inosine acid and hypoxanthine with respect to the total amount of adenosine diphosphate, adenosine monophosphate, inosine acid, and hypoxanthine which are metabolites of adenosine triphosphate, and generally, K value is less than 20% It is said that fish meat can be eaten as sashimi, more than 20% can be cooked and baked, and more than 50% are unsuitable as food ingredients.

After 72 hours at 10 ° C to 15 ° C, a K value of about 10% was measured.

The K value measurement result in the raw tuna stored in the packaging container made from the sample No1 of this Example 9 was shown in FIG.

As a comparative example 19 for Example 9, a polycarbonate having a thickness of about 0.1 mm and containing no additives such as an antioxidant or an antimicrobial agent was prepared, and the size of the bag was about the same as that for raw fish meat. Regular packaging bags were used. As a test method, about 7 kg of raw tuna chop was stored in the comparative example 19 similarly to the packaging container made from sample No1, and the K value used as an index of the fresh tuna freshness was measured. Sampling used the thing after 72 hours.

After 72 hours at 10 ° C to 15 ° C, a K value of about 36% was measured.

The K value measurement result in the raw tuna stored in this comparative example 19 is shown in FIG.

As a comparative example 20 to Example 9, a polyvinyl chloride sheet having a thickness of about 0.1 mm and containing no additives such as an antioxidant or an antimicrobial agent was prepared, and the size of the bag was about the same as that of the sample No. packaging container. General packaging bags for fish meat were used. As a test method, about 7 kg of raw tuna chips were stored in Comparative Example 20 similarly to the packaging container made of sample No1, and the K value serving as an index of freshness of fresh tuna was measured. Sampling used the thing after 72 hours.

After 72 hours at 10 ° C to 15 ° C, a K value of about 75% was measured.

The K value measurement result in the raw tuna stored in this comparative example 20 was shown in FIG.

It is suitable for the purpose of transportation and storage for a relatively long time by keeping fresh fish and meat fresh.

Claims (25)

delete delete delete delete delete delete delete delete It consists of a polyethylene film containing an antioxidant and an antimicrobial agent in the inner layer, and a two-layered plastic sheet laminated with a high gas barrier polyvinyl alcohol film having an oxygen gas permeability of 0.5 to 1.0 mW / m 2 · d · atm on the outer layer. Polyethylene film contains 3-10 parts by weight of catechin and silver ion-based antimicrobial agent as the antioxidant content per 100 parts by weight of polyethylene film in the range of 1: 1/100 ~ 1: 100. In contrast, the synergistic effect of catechins and silver ion-based antimicrobial agents as antioxidants effectively suppresses the growth of microorganisms on the inner layer surface, and promotes the decay of the objects in the sealed space formed of the plastic sheet and the generation of odors. Plastic sheet for packaging containers, characterized in that effectively suppressed. delete The plastic sheet for packaging container according to claim 9, wherein the two-layer structure plastic sheet has a thickness of the polyethylene film of 50 to 200 micrometers and a thickness of the polyvinyl alcohol film of 12 to 30 micrometers. delete The plastic sheet for packaging container according to claim 9 or 11, wherein the polyethylene film contains a preservative. The plastic sheet for packaging container according to claim 13, wherein the polyethylene film has a content ratio of the sum of the oxidizing agent and the antimicrobial agent and the content of the preservative in the range of 1: 1/10 to 1:10. delete delete Polyethylene film containing antioxidant and antimicrobial agent in the inner layer, high gas barrier polyvinyl alcohol film with oxygen gas permeability of 0.5 ~ 1.0 ㏄ / m² · at · m in the middle layer, and polypropylene film laminated in the outer layer The polyethylene film is composed of 3 to 10 parts by weight by adding catechin and silver ionic antimicrobial agent in the range of 1: 1/100 to 1: 100 as an antioxidant per 100 parts by weight of polyethylene film. And antimicrobial agents effectively inhibit the propagation of microorganisms on the inner layer surface by synergistic effects of catechins and silver ion-based antimicrobial agents, as well as the progress of decay of objects in the sealed space formed of the plastic sheet. And effectively suppressing the occurrence of odor. delete The method of claim 17, wherein the three-layer plastic sheet is 50 to 200 micrometers in thickness of the polyethylene film, 12 to 30 micrometers in thickness of the polyvinyl alcohol film, 15 to 50 microns in thickness of the polypropylene film The plastic sheet for packaging containers characterized by the meter. delete The plastic sheet for packaging container according to claim 17 or 19, wherein the polyethylene film contains a preservative. The plastic sheet for packaging container according to claim 21, wherein the polyethylene film has a content ratio of the sum of the oxidizing agent and the antimicrobial agent and the content of the preservative in the range of 1: 1/10 to 1:10. delete delete A bag is produced from the plastic sheet for packaging containers according to claim 17 or 19, and has an opening that can be opened in a part of the periphery, and the opening is formed to be openable by a fastener, and is flat during non-storing of the object. A packaging container which is formed to be thinly foldable.

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